SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE. 



THE 



ANCIENT FAUNA 



NEBRASKA: 



A DESCRIPTION OF REMAINS OF EXTINCT MAMMALIA AND CHELONIA, 



FROM THE MAUVAISES TERRES OF NEBRASKA. 



JOSEPH LEIDY, M. D.; 



PROFESSOK OF ANATOMT IN THE IINIVEB9ITY OF PENNSYLVANIA. 



[accepted for publication, DECEMBER, 1852.] 



